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The electromagnetic force and/or torque, developed in any physical system, acts in such a direction as to tend to
- a)increase the magnetic stored energy at constant flux.
- b)increase the magnetic stored energy at constant current.
- c)decrease the magnetic stored energy at constant flux.
- d)decrease the magnetic stored energy at constant mmf.
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
The electromagnetic force and/or torque, developed in any physical sys...
Explanation:
The electromagnetic force and/or torque developed in any physical system is governed by the principle of conservation of energy. It implies that the direction of the force or torque developed will be such that the magnetic stored energy in the system will decrease at constant flux. Let's understand this in detail:
Conservation of Energy:
The principle of conservation of energy states that energy can neither be created nor destroyed. It can only be converted from one form to another. In an electromagnetic system, the energy is stored in the magnetic field, which is proportional to the square of the current flowing through the coil (i.e., E = 1/2 LI^2). Therefore, any change in the current or flux will result in a change in the energy stored in the magnetic field.
Direction of Force/Torque:
When a force or torque is applied to an electromagnetic system, it will result in a change in the current or flux. The direction of the force or torque will be such that the energy stored in the magnetic field will decrease at constant flux. This is because the system will try to minimize the energy stored in the field by converting it into some other form of energy, such as mechanical energy or heat.
Example:
Let's consider an electromechanical system, such as a DC motor. When a current is passed through the coil, it produces a magnetic field that interacts with the magnetic field of the permanent magnet, resulting in a torque. The direction of the torque will be such that the energy stored in the magnetic field will decrease at constant flux. This means that the motor will convert some of the energy stored in the magnetic field into mechanical energy, which is used to rotate the motor shaft.
Conclusion:
In conclusion, the electromagnetic force and/or torque developed in any physical system will act in such a direction as to tend to decrease the magnetic stored energy at constant flux. This principle is governed by the conservation of energy and is applicable to all electromagnetic systems.
The electromagnetic force and/or torque developed in any physical system is governed by the principle of conservation of energy. It implies that the direction of the force or torque developed will be such that the magnetic stored energy in the system will decrease at constant flux. Let's understand this in detail:
Conservation of Energy:
The principle of conservation of energy states that energy can neither be created nor destroyed. It can only be converted from one form to another. In an electromagnetic system, the energy is stored in the magnetic field, which is proportional to the square of the current flowing through the coil (i.e., E = 1/2 LI^2). Therefore, any change in the current or flux will result in a change in the energy stored in the magnetic field.
Direction of Force/Torque:
When a force or torque is applied to an electromagnetic system, it will result in a change in the current or flux. The direction of the force or torque will be such that the energy stored in the magnetic field will decrease at constant flux. This is because the system will try to minimize the energy stored in the field by converting it into some other form of energy, such as mechanical energy or heat.
Example:
Let's consider an electromechanical system, such as a DC motor. When a current is passed through the coil, it produces a magnetic field that interacts with the magnetic field of the permanent magnet, resulting in a torque. The direction of the torque will be such that the energy stored in the magnetic field will decrease at constant flux. This means that the motor will convert some of the energy stored in the magnetic field into mechanical energy, which is used to rotate the motor shaft.
Conclusion:
In conclusion, the electromagnetic force and/or torque developed in any physical system will act in such a direction as to tend to decrease the magnetic stored energy at constant flux. This principle is governed by the conservation of energy and is applicable to all electromagnetic systems.
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The electromagnetic force and/or torque, developed in any physical system, acts in such a direction as to tend toa)increase the magnetic stored energy at constant flux.b)increase the magnetic stored energy at constant current.c)decrease the magnetic stored energy at constant flux.d)decrease the magnetic stored energy at constant mmf.Correct answer is option 'C'. Can you explain this answer?
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